Direction Simplex simply means that the data flows in one direction
only. From the sender to the receiver and nothing back. Half Duplex means
that data flows both ways, but only one way at a time. Station 1 sends to
2 then 2 sends back after 1 is finished. Full Duplex means that data flows
both ways at the same time.

Clock source Async means asynchronous or "not synchronous" meaning
that there is no clock single provided along with the data signal. sync means
that the data is synchronized to a clock, which is provided by the sender.
The clock may be provided along with the data on the same physical wire,
or on a separate line.

Standard "RS 232" (meaning async serial over
the RS232 physical layer) is considered async, although the start bits
technically provide a byte clock, because the bit clock is
not provided and must be developed by the receiver at the same rate as the
sender. This is the baud rate which must be defined on both sides before
communications can succeed. There are "autobaud" or baud rate detection systems
which enable the receiver to guess at the sending baud rate by examining
the data bits. The standard modem "AT" command set was developed to facilitate
that system as "A" and "T" happen to have bit patterns that are very regular;
"A" is "100 0001" and so has a 1 bit at the start and end and "T" is "101
0100" which has a pattern with every other bit set. It's important to realize
that async serial at a specified baud rate can be used to transmit data over
any of the physical layer standards listed above.

Manchester encoding+is a
synchronous system which provides a clock along with the data while still
using only one wire, and it can be transmitted via any of the physical layer
standards listed here.

Any of RS232,RS422, RS423 or RS 485 can be
simplex, or half or full duplex and at the same time can be synchronous or
asynchronous, however, in most cases RS232 will be used to refer to full
duplex asynchronous over an RS232 physical interface.
+

RS 232 is a non-balanced (1 wire plus ground)
signaling spec for a single transmitter to a single receiver. Most people
use "RS232" to mean async serial over the RS232 physical layer.

RS 422 is a balanced (2 wire) signaling spec for a single transmitter to
multiple receivers

RS 423 is a non-balanced (1 wire plus ground) signaling spec for a single
transmitter to multiple receivers

RS 485 is for multiple transmitters and multiple
receivers, and can be setup in several different configurations of 1 (+ground),
2, or 3 wires, but is typically used with 2 signal wires and a reference
which may or may not be ground.

At least in version 6.1, if you recieve a file with Hyperterm, any byte with
a decimal value of 19 (hex 13, ASCIIDC3, Ctrl+S) will be repeated. e.g.
the string 16 17 18 19 1A 25 26 will be saved as 16 17 18 19 19 25 26 1A.

RealTerm is a new and somewhat buggy terminal program. Watch out when changing
the font or number of lines displayed. It has a great font that allows you
to see the ASCII control characters in ASCII mode

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